Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van hanh » van thanh, ban hanh, van anh
lang lai » lang dai, lang hai, lang mai
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
lai hoi » dai hoi, lai hoa, lai roi
va cam » va cham, va cac, va cao
y lang » o lang, _ lang, tay lang
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, ve cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) y lang lai hoi. hieu ((ve cam) or (va cam)) xuc van hanh va cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y lang lai hoi. hieu ((ve cam) OR (va cam)) xuc van hanh va cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y lang lai hoi. hieu ((ve cam) or (va cam)) xuc van hanh va cua thuoc*.